Unstable air Air in which static instability prevails. This condition is determined by the vertical gradients of air temperature and humidity.
unstable air mass - Air mass having static instability in the lowest layer.
Unstable Air - generally, air which will continue to rise and accelerate when briefly forced upward
Updraft - a relatively small-scale current of air with marked upward motion ...
Unstable Environments
If, however, the rising air cools at a slower rate than the surrounding atmosphere, it will be warmer (and less dense) than its surroundings. Here, the rising air would continue rise.
UNSTABLE/ INSTABILITY Occurs when a rising air parcel becomes less dense than the surrounding air. Since its temperature will not cool as rapidly as the surrounding environment, it will continue to rise on its own.
Unstable Air An atmospheric state warm air below cold air. Since warm air naturally rises above cold air (due to warm air being less dense than cold air), vertical movement and mixing of air layers can occur.
Unstable Air: An atmospheric state where strong vertical motions are produced by displacement of a parcel of air that accelerates upward when the parcel is moved upward, or downward when the parcel is moved downward.
Unstable Air
Air that is able to rise easily, and has the potential to produce clouds, rain, and thunderstorms.
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Unstable Air- air that rises easily and can form clouds and rain.
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Virga- rain falling from a cloud that evaporates before reaching the ground.
UNSTABLE- A situation in which air if lifted adequately will rise on its own due to positive buoyancy. The optimum unstable situation consists and warm and moist air near the surface and cold and dry air in the middle and upper troposphere.
Unstable air layer An air layer characterized by a vertical temperature profile such that air parcels accelerate upward or downward and away from their original altitudes.
unstable—Set instability.
updraft—A localized upward current of air.
upper front—A front aloft not extending to the earth's surface.
Unstable Air - Air that is warmer than its surroundings and as such tends to rise, leading to the formation of clouds and possibly precipitation.
Unstable - thunderstorms probable
less than -5
Very Unstable - heavy to strong thunderstorm potential ...
Unstable Air- Air with temperature differences that encourage the formation of convection currents that can produce clouds and precipitation.
Updraft- An upward current of air, usually within a thundercloud.
Unstable airmasses imply free vertical motion (given an initial trigger action), and the cloud structure is 'heaped' or cumuliform.
Unstable air: see absolutely unstable air.
Upper-air weather chart: weather maps that are produced for the portion of the atmosphere above the lower troposphere, generally at and above 850 mb.
Unstable
A turbulent state in the atmosphere, often caused by cold air moving over warm air. Unstable conditions are also induced by cold air moving over warm water and by strong heating of the ground by the sun.
UNSTABLE - Air having a tendency to rise readily. Deep convection, such as thunderstorms, need moist and unstable air.
The unstable boundary layer that forms at the surface and grows upward through the day as the ground is heated by the sun and convective currents transfer heat upwards into the atmosphere.
Convective Clouds ...
labile"Unstable; literally, characterized by a tendency to slip.
laboratory tank"A device for physical simulation of the atmosphere, using water or other liquids as the working fluid. Classical examples are 1) rotating tanks colloquially ...
stable and unstable atmospheric conditions: If a parcel of air is moved upward due to local convergence, convection, orographic lifting, ...
Absolutely unstable air An atmospheric condition that exists when a lifted parcel of air is warmer than the air around it.
Absolutely Unstable Air - permalink - collapse
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Conditionally Unstable-Atmosphere that is stable with respect to an unsaturated parcel of air, but unstable with respect to a saturated parcel of air.
The term is used specifically to describe vertical transport of heat and moisture, especially by updrafts and downdrafts in an unstable atmosphere.
If the parcel is warmer than its new environment, then the atmosphere is unstable and the potential for thunderstorm development and severe weather increases. SHOWER It is precipitation from a convective cloud.
This occurs most readily in a conditionally unstable atmosphere.LEWPLine Echo Wave Pattern. A bulge in a thunderstorm line producing a wave-shaped "kink" in the line.
When wave steepness exceeds a 1/7 ratio, the wave becomes unstable and begins to break.Steering CurrentsSame as Steering Winds; a prevailing synoptic scale flow which governs the movement of smaller features embedded within it.
Occluded MesocycloneA mesocyclone in which air from the rear-flank downdraft has completely enveloped the circulation at low levels, cutting off the inflow of warm unstable low-level air.
High values indicate unstable and/or weakly-sheared environments; low values indicate weak instability and/or strong vertical shear.
In meteorology, the term is used specifically to describe vertical transport of heat and moisture in the atmosphere, especially by updrafts and downdrafts in an unstable atmosphere.
A relatively unstable compound of three atoms of oxygen, ozone constitutes--on the average-- less than one part per million (ppm) of the gases in the atmosphere (peak ozone concentration in the stratosphere can get as high as 10 ppm).
In the real world, the earth's atmosphere is heated from below by solar radiation, and this becomes unstable. Convection occurs, in which the warm air rises; if cloud condenses latent heat is released and can lead to a positive feedback.
Thus, higher values indicate unstable conditions and/or strong vertical shear. Since both parameters are important for severe weather development, higher values generally indicate a greater potential for severe weather.
A summer high over the North American continent brings moist, unstable maritime tropical air from the Gulf over the Mississippi Valley. The thunderstorms that result are the principal source of moisture for this region.
Answer: Ocean Temperatures in the 1930's Were Unstable
Scientists at NASA's Goddard Space Flight Center recently used a computer model and satellite data to examine climate over the past century.
A thunderstorm that is produced by convection within an unstable air mass through an instability mechanism.
Baroclinic instability is a situation that results from the tight thermal gradients when air parcels are unstable to slantwise forcing.
AIR MASS THUNDERSTORM A thunderstorm that is produced by convection within an unstable air mass through an instability mechanism.
Equatorial Air: Mass of humid and unstable air of equatorial circulation.
Evaporation: Transformation process from liquid water into vapor.
EL - Equilibrium Level. The level where unstable air becomes stable again.
Entrainment - The act of air being drawn into a cloud from the non-cloud environment.
Air-Mass Thunderstorm - A localized thunderstorm that forms in a warm, moist, unstable air mass. Most frequent in the afternoon in spring and summer.
Surface tension on the minute droplets keep them in water form. They are unstable and rupture into ice.
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DUST DEVIL - Swirling air that picks up dust caused by thermal lifting rapidly in unstable conditions.
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instability: a state of the atmosphere when a parcel of air will keep moving either up or down from its starting position when moved. An unstable atmosphere is often associated with severe weather.
 See also: Air, Surface, Temperature, Cloud, Atmosphere
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